A purely geometric distance to the binary star Atlas, a member of the Pleiades

Details A purely geometric distance to the binary star Atlas, a member of the Pleiades A purely geometric distance to the binary star Atlas, a member of the Pleiades

2004-08-24

arxiv.org/abs/astro-ph/0408430v1

Astron.Astrophys. 425 (2004) L45-L48

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, accepted for publication in A&A Letters

Scientific paper

10.1051/0004-6361:200400062

We present radial velocity and new interferometric measurements of the double star Atlas, which permit, with the addition of published interferometric data, to precisely derive the orbital parameters of the binary system and the masses of the components. The derived semi-major axis, compared with its measured angular size, allows to determine a distance to Atlas of 132+-4 pc in a purely geometrical way. Under the assumption that the location of Atlas is representative of the average distance of the cluster, we confirm the distance value generally obtained through main sequence fitting, in contradiction with the early Hipparcos result (118.3+-3.5 pc).

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